/usr/lib/lazarus/0.9.30.4/images/lazdoc.bat is in lazarus-src-0.9.30.4 0.9.30.4-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
..\tools\lazres ..\ide\lazdoc.lrs @lazdoc.txt